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Untangle your stylesheets with Sass
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Roy Tomeij
October 15, 2012
Programming
8
900
Untangle your stylesheets with Sass
As presented at FOWA London, FOWA Prague, Kings of Code and CodeConnexx.
Roy Tomeij
October 15, 2012
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Transcript
Untangle your stylesheets untangle your stylesheets Roy Tomeij / @roy,
80beans
writing CSS isn’t fun
None
today’s lesson
back to basics
it’s just CSS
two syntaxes: SCSS & Sass .scss { width: 100%; }
.sass width: 100% SCSS Sass
variables $full-width: 100%; .foo { width: $full-width; } .foo {
width: 100%; } Sass CSS
nested rules .foo { width: 100%; a { color: #fff;
} } .foo { width: 100%; } .foo a { color: #fff; } Sass CSS
parent reference .foo { color: #000; &:hover { color: #fff;
} } .foo { color: #000; } .foo:hover { color: #fff; } Sass CSS
mixins @mixin hide-text { text-indent: -999px; overflow: hidden; } .foo
{ width: 100%; @include hide-text; } .foo { width: 100%; text-indent: -999px; overflow: hidden; } Sass CSS
selector inheritance .error { color: red; } .bad-error { @extend
.error; font-weight: bold; } .error, .bad-error { color: red; } .bad-error { font-weight: bold; } CSS Sass
data types $number: 1; $string: "Some string"; $color: blue; $color:
rgba(#f0f, 0.5); // Sass gets this! $boolean: true; $list: facebook, twitter, youtube;
operations $column: 10px; .foo { width: 10px + 2px; width:
2in + 8pt; width: $column / 2; } .foo { width: 12px; width: 2.11111in; width: 5px; } CSS Sass
None
control directives $network: linkedin; .foo { @if $network == twitter
{ background: blue; } @else if $network == youtube { background: red; } @else { background: magenta; } } Sass
control directives .foo { background: magenta; } CSS
control directives @each $network in twitter, facebook, youtube { .icon-#{$network}
{ background: url("#{$network}.png"); } } Sass
control directives .icon-twitter { background: url('twitter.png'); } .icon-facebook { background:
url('facebook.png'); } .icon-youtube { background: url('youtube.png'); } CSS
media queries h1 { width: 500px; @media (…) { width:
400px; } } h1 { width: 500px; } @media (…) { h1 { width: 400px; } } CSS Sass
shiny new features
placeholder selector %error { color: red; } .bad-error { @extend
%error; font-weight: bold; } .bad-error { color: red; } .bad-error { font-weight: bold; } CSS Sass
@content directive @mixin ie6 { * html { @content; }
} @include ie6 { .foo { color: red; } } * html .foo { color: red; } CSS Sass
let’s get creative
retina mixin @mixin retina { @media (min--moz-device-pixel-ratio: 1.5), (-o-min-device-pixel-ratio: 3/2),
(-webkit-min-device-pixel-ratio: 1.5), (min-resolution: 1.5dppx) { @content; } } Sass
retina mixin h1 { background: url("image.png"); @include retina { background:
url("
[email protected]
"); } } Sass
retina mixin h1 { background: url('image.png'); } @media (min--moz-device-pixel-ratio: 1.5),
… { h1 { background: url('
[email protected]
'); } } CSS
making stuff fit
breakpoint media queries @mixin respond-to($device) { @if $device == tablet-portrait
{ @media (max-width: 768px) { @content; } } @else if ($device == phone-portrait) { @media (max-width: 320px) { @content; } } } Sass
breakpoint media queries h1 { width: 600px; @include respond-to(tablet-portrait) {
width: 100%; } @include respond-to(phone-portrait) { width: 200px; } } Sass
breakpoint media queries h1 { width: 600px; } @media (max-width:
768px) { h1 { width: 100%; } } … CSS
inline images .facebook { background: inline-image("facebook.png"); } .facebook { background:
url('data:image/png;base64,…'); } CSS Sass + Compass
inline images %facebook { background: inline-image("facebook.png"); } … CSS Sass
+ Compass
things you may not know
!comments /* Nothing... */ /*! Copyright 2012 */ /* Copyright
2012 */ CSS Sass
variable arguments @mixin foo($args...) { // $args is now a
list! } h1 { @include foo(#000, #fff, #ddd); } Sass
nested @import .foo { color: red; } somefile.sass
nested @import h1 { @import “somefile.sass”; } CSS h1 .foo
{ color: red; } Sass
questions? @roy
thanks shorpy.com! for the awesome pictures